Mobile jack stand



June 19, 1956 v. w. SCHROEDER MOBILE JACK STAND Fild July 31, 1953 INVENTOR; V/A/CG Y? W. Sch 20E zlrroems vs United States Patent 2,751,191 Patented June 1 9, 1956 MOBILE JACK STAND Vincent W. Schroeder, Wentzville, Mo. Application July 31, 1953, Serial No. 371,471 1 Claim. (Cl. 254-2) This invention relates to a device adapted to be readily moved from placed to place, on which device there is removably supported a conventional jack unit, the device including vertically shiftable rarn means adapted to be which I have knowledge.

An object of the present invention is to provide a mobile jack stand on which the conventional hydraulic jack can be positioned.

Another object is to provide a mobile jack stand which includes a collapsible handle so mounted upon the base of the stand as to be swingable inwardly toward the base or outwardly therefrom, the handle being extensible in its outwardly swung position so as to elongate the same.

A further object of the invention is to provide a mobile jack stand which is rugged in construction, composed of a minimum of parts, and is capable of manufacture at a relatively low cost.

Other objects will appear from the following description, the claim appended thereto, and from the annexed drawing, in which like reference characters designate like parts throughout the several views, wherein:

Figure 1 is a side elevational view of a mobile jack stand formed in accordance with the present invention;

Figure 2 is an end elevational view taken from the left of Figure 1;

Figure 3 is a sectional view taken substantially on line 33 of Figure l; and

Figure 4 is a vertical sectional view taken substantially on line 44 of Figure 2, the full lines indicating the handle in its collapsed, inwardly swung position and the dotted lines indicating the handle in its outwardly swung, extended position.

The reference numeral has been applied in the drawing to designate a fiat, rectangular, horizontally disposed base plate integrally formed at opposite sides thereof with vertically depending, relatively low side walls 12. The base plate and side walls together constitute a base, and for the purpose of facilitating the movement of the device from place to place, I provide a pair of rollers 14 the trunnions of which are journaled in bearing openings provided in respective side walls 12, said rollers extending between the side walls below the base plate as best shown in Figure 4.

A rollable base is thus provided, and so as to rein force the sides of the base where the rollers are journaled therein, side plates 16 are utilized, said side plates having openings at their opposite ends receiving the end portions of the rollers, the side plates extending along the outer surfaces of the respective side walls 12 of the base.

Carried by the base is a guide cylinder frame, and said frame includes, in the illustrated example of the invention, equidistantly spaced, upwardly converging, straight legs 18 Welded or otherwise fixedly secured at their lower ends to the respective corner portions of the rectangular, rollable base 10.

The upwardly converging legs 18 are spaced apart at their upper ends, and in the space between the convergent portions of the legs I provide a vertically extending, relatively elongated, open ended guide cylinder 20 the upper end of which may be reinforced by a circumferential bead or flange 22. The guide cylinder 20 defines a guideway spaced above the base, and as will be noted, said guideway is centered relative to the base, above a conventional jack designated generally by the reference numeral 24.

The jack 24 is removable from the base, and is not bolted to the base or otherwise secured thereto. It is merely necessary, when the jack stand is to be used, that a conventional jack such as the hydraulic unit shown be positioned upon the open center area of the base plate 14 below the guide cylinder 20. Thereafter, the handle 26 of the jack can be inserted in proper position as shown in Figures 1, 2 and 4, and the jack can be operated for the purpose of elevating the extensible portion or plunger thereof.

A collapsible, pivotally adjustable handle is provided upon the device, to facilitate the movement thereof from welded or otherwise fixedly secured to the rear edge of the base plate It said hinge sleeves being coaxially aligned and being spaced transversely of the base. Rotatable within the hinge sleeves 28 are the inwardly turned ends 36 of upwardly converging yoke arms 32, the yoke arms 32 cooperating to define a yoke of inverted V shape. At the apex of the yoke, between the convergent ends of the arms 32, there is Welded or otherwise fixedly secured a sleeve 34, and slidable and rotatable within the sleeve 34 is a handle extension member 36.

as to cause the lug 40 to engage upon the ledge 42. The ledge 42 can, of course, be suitably recessed to receive the lug 44), if desired.

of the yoke. The yoke can then be swung to the position shown in full lines in Figure 4, in which position it will be out of the way during maintenance or repair of the tractor, or during storage of the jack stand.

Vertically shiftable within the guideway defined by the cylinder 20 is a ram 44, said ram 44 being formed from a length of tubular material the side wall of which is slidably engaged with the cylinder 20. At its lower end, the ram 44 has an end wall that seats upon the upper end of the plunger or extensible part 46 0f the jack 24. At its upper end, the ram 44 is provided with a horizontally disposed, flat, rectangular load-support plate 48 the upper surface of which can be covered by a friction-producing layer 50. The friction-producing material can be ordinary brake lining material or the like, and it will be understood that preferably, said material is bolted to the plate 43 in the manner shown in Figure 4 to facilitate replacement.

In use of the device, the jack stand is maneuvered to any selected location, and thereafter, the jack unit can be operated to elevate the ram 44. This will cause the structure to be lifted to the desired extent, and relative slippage between the lifted object and the plate 48 is prevented by the friction-producing covering 50.

In each position to which the jack stand is shifted, the ram can be rotated as necessary to properly locate the same relative to the engaged object.

It is desirable that means be provided for receiving the jack handle 26, when the jack handle is not in use, and to this end an upstanding socket 52 is welded to the base plate, at a suitable location upon the marginal area thereof.

An important characteristic of the invention resides in the adaptability thereof for association with conventional jack units, it being unnecessary to modify said jack units in any way. Further, the fact that the jack units are merely allowed to rest upon the center portion of the base plate permits said jack units to be used for other purposes, without the stand shown, whenever desired. Still further, the construction allows any size of jack unit to be employed, without requiring modification or redesign of the device or, for that matter, of the jack unit to be used.

It is believed apparent that the invention is not necessarily confined to the specific use or uses thereof described above, since it may be utilized for any purpose to which it may be suited. Nor is the invention to be necessarily limited to the specific construction illustrated and described, since such construction is only intended to be illustrative of the principles of operation and the means presently devised to carry out said principles, it being considered that the invention comprehends any minor change in construction that may be permitted within the scope of the appended claim.

What is claimed is:

A mobile jack stand comprising a base plate, two opposed pairs of legs having upwardly converging ends secured by their lower ends to said plate one leg at each corner thereof, a vertically disposed guide cylinder secured to said legs at their converged ends, a ram slidably operable in said cylinder, a pair of axially aligned hinge sleeves secured to said base plate on one edge thereof, a handle including a pair of upwardly converging arms positioned between the two legs whose lower ends are secured to said base plate adjacent said one edge thereof and extending in longitudinal spaced relation with respect to-said two legs, the lower ends of said arms being connected to said hinge sleeves for swinging movement of said arms from the longitudinal position to a position at an angle with respect to the longitudinal position, a vertically disposed sleeve secured to said arms at their convergent ends, a handle extension having a grip at one end arranged in an upright direction with respect to said arms with the grip adjacent the convergent ends of said arms and supported intermediate its ends for both sliding and rotating movements in said last mentioned sleeve, and a lug on the other end of said handle member and engageable with a ledge fixedly carried by one of said arms below said last mentioned sleeve for limiting the sliding movement of said handle member outwardly of the latter named sleeve.

References Cited in the file of this patent UNITED STATES PATENTS 702,969 Knight June 24, 1902 1,227,480 Miller May 22, 1917 2,050,000 Frost Aug. 4, 1936 2,314,589 Mandi Mar. 23, 1943 2,403,122 Reisert et a1 July 2, 1946 2,479,100 Connor Aug. l6, 1949 2,545,813 Jackson Mar. 20, 1951 2,604,640 Junkin July 29, 1952 FOREIGN PATENTS 681,807 Great Britain Oct. 29, 1952 

